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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3c8d69f163217689bc33dc27bb1a8399f6ae38cf9cbd527b759300be1cd5b2' 
  AND token = '94Z2LVjFkZ9Z6Ihmw+iWy6WDsf13KXSPNjEg7NQASvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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