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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a64ef8c2f79bd7388c6f9edb1e61f0cac8a2daba6ed98318209521edf470e2' 
  AND token = '9uISj1lCbqL/jt61RmIxaqSQBgyFC4DeB0qDgapNtXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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