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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5760d39e5cc13e75fe21c60ec3dd619c364340331da47f876a1b492b9ec01bde' 
  AND token = 't9ELqBPiROYz6Dvoqvr6lB7fjBCKwKJveOTr/0YO0W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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