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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3175b2f067f08564941ba5b22a00335926c8ca1c65bb543ff32c5fd2c7f69f8c' 
  AND token = '8P/8GZY8McSdl2TkdbM7f7K6mIoJzEXlAXnwWFwDsiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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