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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41553325d62c46e2fd9131fe7628ce7c00746a40d2546a86a280ba6139897214' 
  AND token = 'Y+9fwDVTfL4tB7mNZ/4ErC0o8UQlgI5ykw1Sc3MDh+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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