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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c09a7355df9cbce6cbde8c6e364ff3e7f334f6c97f5d56feff39fa27177a52' 
  AND token = 'k7lJyqbDAoql21py2sircJ47e9l88scjctescNi0XK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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