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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13087845bdbda1468df5b8b792aca1daf6b6e0c88d3c78af549f42d697ab1240' 
  AND token = 'eGMWXXcAcitfczGbu/Bd3OHgKXJ+RsRydKWS0KRwC5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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