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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e8a1f1a797b71afbd20f7fc1e77f577207a9b8e281c3177efea9eccc0246ae' 
  AND token = 's3jUscImVR9rr6TIZp8+Ly/ur4b/rquCAXlybp9QW5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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