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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f02a8f0de4e7229f2f1aa04147ce4cc318359c1a3093628cbf261a0bba0b042' 
  AND token = '9M2r4vTRnBqAsZ9s4opL98hrig7vzjtIcaspsrxIpCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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