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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61dd6df48834d1c689a045ce717c0b9419ea18ab9ff001130fd0d21a60111b9e' 
  AND token = '2VoGm77jDWNwGv8In3wG3cV7ueOcQpYhqB939QwBcM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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