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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11bc21f5d870630e3b712cc07d480ccba8c08ef034a42aa45a0f47050ebde6c' 
  AND token = 'dfdYWf97732KYius5OQa6WmtOFRIlZcmS4A4GC7dSYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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