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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eda0d3628cc16a2df64639228c0c8908f7bc2f4cc84f391dc8497953a100f2e' 
  AND token = 'SvZ31y8ieBdcWhwj5i1Hjef2s0Fgs3V3VfO+uosqozs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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