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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a89d781c4f73f266fdb0d2c9802bda77af96ffbf6a8046d6c8e5bb720a7f37' 
  AND token = 'e3/EbZC07mnoxarGelC7eNCV4rTfKFirqdNKgY2xI4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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