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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6039cd76d49e350500cefb863061d5b7db464f52e3cd63b61556b1df13b8f5de' 
  AND token = '+o8KrC5CZVr1EillA8U1W3rmU//HlPiBge7GgfLadhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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