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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7477891b0c8ba00169353652bb9808f34065a0415f2a8dcc59e10e80b5d98f49' 
  AND token = 'TWAq+m0tpIpYjxDmJPzu8GC79fACb91ai3YtRlR6uVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}