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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c83c179d647c8dcc920a8d5c72b088139d54013d43782911f83f6eae63badd' 
  AND token = 'SZ5V9lFUSCqjFazuMCrOt1RCQ3LSUGpORRhATomrzeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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