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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a7e4a8dc31cbd17637fbf1696dc81bd86ae1cf35e4b8abc65dd71dd8d6e83b' 
  AND token = 'lPJE8nTJK87BksDyD2etq3veSSUXqfKPOcxQf3X1/v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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