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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9c122ea8cbe5f1cd44f945805e51689a275d2e740d4123815a02d4793e7b40' 
  AND token = '5fZkU9KsjgChO+1Bqlcd8kp5L7zpFV8+2mu46+3yva4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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