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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd011a32c86e57f665f39fc10d94d2c8966a538207d4199b796c235c7f0d927' 
  AND token = 'lFjbdn5e7j7acrA5p7yaRMHS/AaSsqWvowV4+84R87k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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