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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323a9c33ceb8cd4fd0cf9d2e65f6280e9035a0fde2603ae2c427f044d455c10e' 
  AND token = 'GC6kCpnRMeN5LPjIR00G1v0024/UYM5PKjbeBTPeRck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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