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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285d8cd51a95592847a8b8c00d9670ca87b4724ef5c5776de0f0af229b5e9032' 
  AND token = 'X6C3eLFii0ZLWEaC1vRwHYf5dc88D3stEzOBUhr6Pqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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