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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e66be878f6673e741d54100cdd23d4e860ee26dd3de2dc734d7cc2d2cd70d295' 
  AND token = 'jviClo1WeER6KJft4D+M2KP1T7oU+lUUaLAIc1O3SKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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