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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efcc1409fc9596693425d4c14813765d92b1b11ceec9a71a49993f684d562afb' 
  AND token = 'CFyg+9Ikc8gOnKdrDSu2GEhJtao5WRnQtWUPP8CNxCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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