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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19bbb05725470c75886c7c033cc6985f2c868205b42bfb4f7f5e0758c48de4f9' 
  AND token = '5j5iagq54yGqMD06DckaeDGOGQk3iR69HiiMxKqOZ8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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