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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7593f5af3b745b8f0c5c88b612d486ac21af9f2b1b9e1acedef32fc0ffc981cb' 
  AND token = '2EGO3AVHO+a+gvT8dAVcUWDt0QJ0+QpTMmxXMctpC5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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