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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ccaa160914a05827fb9c5deb8cc8ab0e255cbbfae6b01d37ef8093d62cc61d' 
  AND token = 'nh/Tq/g3xjyQ8kiWXWJrgtDp8SOEfVrYFd/CL3Sh40E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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