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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41a777d5ff087b3eca6c0f9c8ad877c80f1f9353da6983577ccf1f2747d57ca' 
  AND token = 'KmCcqgXxHhESGlAqD/WYLmiM56Hc2DmTcWX/+4KtNsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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