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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6240745d98fc305d7d9e805e8548ba14a988eed9025c9ab94f133f65083b3b4' 
  AND token = 'o0H8eszUTqKHsTMLBnh4CYdBiAR2rCtWqtCL9bIK41o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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