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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc23517d940abeaa05bb0d380470b881f96a343736181e144615b3a1fe0505d1' 
  AND token = 'IP3ePdXbKgWkO63usPAMmUMfS0c2+dhxKzC+DYDBv0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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