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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6dc34ac8454f44eb24fc31e2f2f79407fd634df424dc08ecd7f058e8f460c43' 
  AND token = 'VvlzgzCRAuQfSPbye8SuavffMqx2cDweXX3kQErezA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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