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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7576a63f98534563de9d3147cb75f75335b58f9d7e675ec001b86298295cf4f3' 
  AND token = 'eCueZlNeu6Q50qXeOhtsLfbuU15g7nXzaFZYb30N2yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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