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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12db584f39009f7d559a2d215faf67e7171c77c8a6cf618d85ec237a7d85f7a' 
  AND token = '8J50yG+jIK1YJLe/ML3tcEM5nQ/3fLZs9/ToNyf9jT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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