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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6fab0b3c9cec2087f285308787052a38e1b1f8442392b18befee32b4aeb5ae' 
  AND token = 'ggZWaRBYiIqFxen4Ts2/p447pLTZ14Mpn3qVxVz0XfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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