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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447b4ae6be22e32a71a4e0bd1f5ab371296acb4301a4f858d57dc1fbbc85dedc' 
  AND token = 'zH2Xl927R2NLO3JpEiu7GVtubnK36C7Qh6beAHU4jJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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