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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9998c6f1a2dbef2eddf322427b9e6eaa64472b235d8f8c47cee1c72e57b5baf8' 
  AND token = 'AC6csgQ1wM4UIc5/JZ//JM6Bc9Uz0KMRQhnxT96DNl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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