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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a820c684bf8fc0e7810f025a478dda9345daf24ae6ec592381bb9e37d0cc59' 
  AND token = 'ZLoTGUqh0iB+pqix0N53+tpmr1VauS9VQY0wDhw2A5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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