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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6574bbcfdbfba853cd7dba37623171bfff9d4eb0fdaebee3c26bb6f8d0a41f' 
  AND token = 'qwV/tf0CGlt+IY0rtsdQ6qN4/94q3f1cRrroIEPiiYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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