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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9f665b56745f17a732c248cd857dbc33baa5203f3a64122774b5b3f4a82ee6' 
  AND token = 'lmkTCSAp+HWfoZShlPYRlcIIjMG1MsodkoHVQ5UFszA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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