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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07df3a2f0574aac4db4ed1a4fdb633bcf2f9cb069aef9ee7345ffc883669fc4' 
  AND token = '196LFt/tLajLxr5qxcB9wkmxRmVePUNswCWXfGKdmT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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