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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3723856e2a1e1a3920b166fd162b4f58c64ac5e0f76bbe93d0a523ba84cc6d' 
  AND token = '0Y1VZ9+ME8ZlpHw8kNp7SLnVZovOZoL99kBIqtzTi4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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