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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31d0426c31a9f611c10c9f14ef9a5cc4004f67ebe414249d6a69109bfae8f41' 
  AND token = 'AvdgAlrgQYi4cDOZHbiQo8YkgPVJo26MJJ23sNgEeik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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