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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e698a321f3df75c036786b7ccee4f319395f65e9794bafc96f0bb7b630b71e' 
  AND token = '+lZajgdrXtjrbzTne3bQ0eq0csIA75wleKoAerco2JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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