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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af46005576e33c2d10588d259751ed99b59035224d6e3cf1e9eabac9709ed977' 
  AND token = '1leNGeW6eRGB5odutW9Sdfv42tw4rRAKaTHoAZNaC9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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