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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351f4d73284f077de8a51ed76397a19231b8d56871380a680846793cb04c0967' 
  AND token = 'E1EgPf/7mge3Mo1EsD+pvqKrCWJ0TetKr9EbyyPoBc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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