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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15084b5815a08383c24e21601774349846c49df4eccbcea933cc4a4c803820f5' 
  AND token = 'SwbXJTzZ9XhrDsLfS1cdJp5+eJ/Fa+RYujh6RkLtZEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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