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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78c4ad002aef4de84393e0f5e7d61de999aa92f51f97f8da11df06622ff080be' 
  AND token = 'OZyiJy/V46iiYQGYlNKctTTt5WW37s47mtRsT9x1iio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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