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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91eb50bbac3432608ccb66b7d1e1eb831acd8d7f3144d931a3d2938a0fad269' 
  AND token = 'eaipcaL/ZTW0jWWHd4KB6zFKYv7TRO6IM6G5HLILuJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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