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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40485651304e750df183f79f17855129bb44dceb56744005a5090ed9d72dbc91' 
  AND token = 'rOPN1VQZHsvTFr1ShBjj2mnbkUP+Y4DL7C2zdONH/3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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