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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca27f482028a6a8a3ca880736f04708eaacb1605568ef1d2f7f17ee00019c79' 
  AND token = 'C0U+IycDi0/Gx4geD804SRKhnnYTr2S+qJ76DY9UoXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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