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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f9b5347559d85ab00cf6cc9f7c7a6993b0c343e3b405ac60ef6096308f8b73' 
  AND token = 'MUZk8/TxB718rCx4OSt7Otofjw7R88YruJzfZSNTHkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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