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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c123875d8a353d48011bde05e933e82a4a1f6e53418e9dbe456afed18bff048' 
  AND token = '8GDXLQ2J6qMpdL/JvsYsWcjV9yH35acemh4pevMwn2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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