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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ec68ab717b0768c8413a10298e21f4b0c3ff2b4d888ca84d7beb9a31e61a9d' 
  AND token = '0AFDm/oSzJbVTTTarP6/NgkJo0alz43TYu8IhxLk0FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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