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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a5bde3f6eb8a817285594524088a2fa7e97776e199a9e086bb951a2d9669efb' 
  AND token = '/dqwZ9P8kaaeLQuJN7lXxXSW47nEJV4RFuTVWZtGZ7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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