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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea70ddf31c49fd40f8e94fab5b28ef31960ce711306c551dba095512a6f5388' 
  AND token = 'wZTaAPdUjc6R38f1EHfkKe6VPpsJ6M07sa8cC04pLqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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