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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc467472a323c8c49f3418f274a9300b2947ff65ce60036c561792c293b8ea3' 
  AND token = 'RFD4V5Os5bQUWb4cK5i3fwVMvaM4gIR9vr21ZjRWBE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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