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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7874fabadab61b80a1467efaaff56fa7f8feb4c9932547e297a21b42a1c4572c' 
  AND token = 'T6IdObIiCNnvLw/anJYO5qjfldYOFJ/9KwONq8Wnwrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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