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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '327b1470c3d5a7ff7941d06e0db9a9cd0b76404beb00e7ab5b4ce265e98064d9' 
  AND token = 'am9ziPHSk3LKp6EB9vnBZTWmWOdJGg8WprQkpgwiUaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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