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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08234a859692c78d8acc123a181d658c11021966706ab0550f9545c91352dddb' 
  AND token = 'FPDlbj+dsxyyA7tz+z33q0jZEinr7l1Tej9YQf4nS40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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