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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6df5f702bc7bf5ae0240d365fbd7b38a5922ddf9cbd1ca5761c7cd93a011a1c' 
  AND token = 'J2ZMXptcGtUn6IQppHCgsHYbFxRcCdP9oQ6y89ioK0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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