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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611802300ea33ea4b4b094b818ee216b04eaec4a9d0bc19f83c60275372b8868' 
  AND token = 'IGKzZAyTbHMiykXBDF/v+GPcVpOmjUg62I9mjH2cG98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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