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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8abb60e601178186a11d7a71216996ea6cf746312b2ca78e84a88fb47c16a2f' 
  AND token = 'wlrqJQDE7b2NMIljuFzxoDljp75qLnr+hSD6IZ6ZEp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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