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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26977805dc74389a7242624bd19fcb501199cdff824939a1f63e254f3b17b3aa' 
  AND token = 'iLz7Zt6x/XCtUBTWWx38Iz6vN2YEBzl2uYRpiWjcFzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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