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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1968639693897fc9d01a1f069f82071113a492f8cef4512c4c6ca2511ba11c1c' 
  AND token = 'uYK+2tqf5QzJkD05DvKSjJCAqibhCnNzKD5dt2qYfYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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