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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d726c09af9cda2968b80aea654e60a0a39c14f4f250f26e935d1a8c850d44d' 
  AND token = 'AAd4N2zvzspVmDm2KWjxJyXkrWqZpNRW1YSdwGBOsDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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