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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d6312cd020c07f8591d5e2350262f033331641d8e7b9d3a191b7776f26b956' 
  AND token = 'AmRqNeh3Um9+/UOzWxbvWHNlDl94MmFx1B23bB6ZfhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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