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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '843f888b1a88894385dceb539cab7aa04ba4639c3431a42be2d0a63799d6ffd1' 
  AND token = '0nG3FS6rZELjUh4FIdj7zTaUNXim5/Fz/lLjXattHK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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