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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74e99066d8c5de00b6a786d1cc8c1dc8a68ae8a99e217c00866cbc3fa8b20ed' 
  AND token = 'coa/w/WYtYEw4Rw8V6RfXO87dqCabZQ37NsUIGnQ6HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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